Formed 12 Feb 1820, 405 square miles
Parent county: Delaware
Evolution of county from date of formation until it assumed its final form
1 Apr 1820: Erected and attached to Delaware until organization of Marion
1 Mar 1824: Organized and part of Crawford attached temporarily until organization of Crawford
1 Apr 1826: Diminished by organization of Crawford
3 Feb 1845: Diminished by formation of Wyandot. Part attached to Crawford
1 Mar 1848: Diminished by formation of Morrow. Part of Delaware attached.
Federal Population schedules extant from 1820-1940. (1890 missing)
1820 Manufacturers (part of Delaware); 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Agricultural; 1860 Mortality; 1880 Agricultural; 1880 Defective, Dependent, and Delinquent
Big Island, Bowling Green, Claridon, Grand, Grand Prairie, Green Camp, Marion, Montgomery, Pleasant, Prospect, Richland Salt Rock, Scott, Tully, and Waldo.
Jana Broglin, CG, OGSF